Are the main characters in a relationship or love each other in this anime/manga?

There are some characters that are in a relationship (for example Vincent and Ada) or are married, (like Duke Nightray and his wife) but that's all.The rest of the cast doesn't show any signs of being in a romantic relationship and even though there may be some hints (like the OzxEcho on Ch33 and others)everything is mostly fans's speculations.